GNU Classpath (Essential Libraries for Java) is a project to create free core class libraries for use with virtual machines and compilers for the java programming language. It includes all native methods and core classes necessary for a completely functional java runtime....

Fractal is a modular, extensible and programming language agnostic component model that can be used to design, implement, deploy and reconfigure systems and applications, from operating systems to middleware platforms and to graphical user interfaces. The goal of Fractal is to reduce the development, deployment and maintenance costs of software systems in general, and of ObjectWeb projects in particular....

A complete model-view-presenter framework to simplify your next GWT project.,

Openbravo is a fully functional integrated web-based open source ERP that is much more at a cost that is far less: be the true owner of your ERP and only pay for the professional support that you really need. The solution is designed for SMEs that are looking for an integrated way to manage their operations, optimize processes, increase customer satisfaction and ultimately increase profitability....

Apache Mahout's goal is to build scalable machine learning libraries. With scalable we mean:
Scalable to reasonably large data sets. Our core algorithms for clustering, classfication and batch based collaborative filtering are implemented on top of Apache Hadoop using the map/reduce paradigm. However we do not restrict contributions to Hadoop based implementations: Contributions that run on a single node or on a non-Hadoop cluster are welcome as well. The core libraries are highly optimized to allow for good performance also for non-distributed algorithms...

Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. A pure Java library, it can be embedded into your applications to create anything from a full XMPP client to simple XMPP integrations such as sending notification messages....

Spock is a testing and specification framework for Java and Groovy developers. What makes it stand out from the crowd is its beautiful and highly expressive specification language. Thanks to its JUnit runner, Spock is compatible with most IDEs, build tools, and continuous integration servers. Spock is inspired from JUnit, jMock, RSpec, Groovy, Scala, Vulcans, and other fascinating life forms....

FEST is a collection of compact and fluent APIs, which mission is to simplify software testing. The project provides libraries for:

• Functional testing of Swing-based UIs
• Functional testing of JavaFX-based UIs
• Fluent interface for assertions...

Nifty GUI is a Java Library that supports the building of interactive user interfaces for games or similar applications. It utilizes lwjgl for OpenGL rendering. The configuration of the GUI is stored in xml files with little supporting Java code. In short Nifty helps you to layout stuff, display it in a cool way and interact with it :)...

JSMPP is a java implementation (SMPP API) of SMPP protocol (currently support SMPP v3.4). It provides interfaces to communicate with Message Center or ESME (External Short Message Entity) and able to handle traffic 3000-5000 messages per second.

SMPP is stand for Short Message Peer to Peer. It is a standard protocol for exchanging SMS messages between SMS entities over TCP/IP or X.25 connections. ...